Add Windows implementations of pread(), pwrite(), writev()
authorEric Biggers <ebiggers3@gmail.com>
Sun, 5 May 2013 03:00:34 +0000 (22:00 -0500)
committerEric Biggers <ebiggers3@gmail.com>
Sun, 5 May 2013 03:00:34 +0000 (22:00 -0500)
src/util.c
src/util.h
src/win32.c
src/win32.h
src/write.c

index 485303e..709ba46 100644 (file)
 #include <errno.h>
 #include <stdarg.h>
 #include <stdlib.h>
-#include <sys/uio.h>
 #include <unistd.h>
 
 
 #ifdef __WIN32__
-#include "win32.h"
+#  include "win32.h"
+#  define pread         win32_pread
+#  define pwrite win32_pwrite
+#  define writev win32_writev
+#else
+#  include <sys/uio.h> /* for writev() and `struct iovec' */
 #endif
 
 static size_t
index e32496a..7bff1b5 100644 (file)
@@ -299,7 +299,15 @@ full_pread(filedes_t fd, void *buf, size_t nbyte, off_t offset);
 extern size_t
 full_pwrite(filedes_t fd, const void *buf, size_t count, off_t offset);
 
+#ifdef __WIN32__
+struct iovec {
+       void *iov_base;
+       size_t iov_len;
+};
+#else
 struct iovec;
+#endif
+
 
 extern size_t
 full_writev(int fd, struct iovec *iov, int iovcnt);
index d403fba..4333646 100644 (file)
@@ -78,6 +78,279 @@ win32_error(u32 err_code)
 #  define win32_error(err_code)
 #endif /* !ENABLE_ERROR_MESSAGES */
 
+static int
+win32_error_to_errno(DWORD err_code)
+{
+       /* This mapping is that used in Cygwin.
+        * Some of these choices are arbitrary. */
+       switch (err_code) {
+       case ERROR_ACCESS_DENIED:
+               return EACCES;
+       case ERROR_ACTIVE_CONNECTIONS:
+               return EAGAIN;
+       case ERROR_ALREADY_EXISTS:
+               return EEXIST;
+       case ERROR_BAD_DEVICE:
+               return ENODEV;
+       case ERROR_BAD_EXE_FORMAT:
+               return ENOEXEC;
+       case ERROR_BAD_NETPATH:
+               return ENOENT;
+       case ERROR_BAD_NET_NAME:
+               return ENOENT;
+       case ERROR_BAD_NET_RESP:
+               return ENOSYS;
+       case ERROR_BAD_PATHNAME:
+               return ENOENT;
+       case ERROR_BAD_PIPE:
+               return EINVAL;
+       case ERROR_BAD_UNIT:
+               return ENODEV;
+       case ERROR_BAD_USERNAME:
+               return EINVAL;
+       case ERROR_BEGINNING_OF_MEDIA:
+               return EIO;
+       case ERROR_BROKEN_PIPE:
+               return EPIPE;
+       case ERROR_BUSY:
+               return EBUSY;
+       case ERROR_BUS_RESET:
+               return EIO;
+       case ERROR_CALL_NOT_IMPLEMENTED:
+               return ENOSYS;
+       case ERROR_CANNOT_MAKE:
+               return EPERM;
+       case ERROR_CHILD_NOT_COMPLETE:
+               return EBUSY;
+       case ERROR_COMMITMENT_LIMIT:
+               return EAGAIN;
+       case ERROR_CRC:
+               return EIO;
+       case ERROR_DEVICE_DOOR_OPEN:
+               return EIO;
+       case ERROR_DEVICE_IN_USE:
+               return EAGAIN;
+       case ERROR_DEVICE_REQUIRES_CLEANING:
+               return EIO;
+       case ERROR_DIRECTORY:
+               return ENOTDIR;
+       case ERROR_DIR_NOT_EMPTY:
+               return ENOTEMPTY;
+       case ERROR_DISK_CORRUPT:
+               return EIO;
+       case ERROR_DISK_FULL:
+               return ENOSPC;
+#ifdef ENOTUNIQ
+       case ERROR_DUP_NAME:
+               return ENOTUNIQ;
+#endif
+       case ERROR_EAS_DIDNT_FIT:
+               return ENOSPC;
+       case ERROR_EAS_NOT_SUPPORTED:
+               return ENOTSUP;
+       case ERROR_EA_LIST_INCONSISTENT:
+               return EINVAL;
+       case ERROR_EA_TABLE_FULL:
+               return ENOSPC;
+       case ERROR_END_OF_MEDIA:
+               return ENOSPC;
+       case ERROR_EOM_OVERFLOW:
+               return EIO;
+       case ERROR_EXE_MACHINE_TYPE_MISMATCH:
+               return ENOEXEC;
+       case ERROR_EXE_MARKED_INVALID:
+               return ENOEXEC;
+       case ERROR_FILEMARK_DETECTED:
+               return EIO;
+       case ERROR_FILENAME_EXCED_RANGE:
+               return ENAMETOOLONG;
+       case ERROR_FILE_CORRUPT:
+               return EEXIST;
+       case ERROR_FILE_EXISTS:
+               return EEXIST;
+       case ERROR_FILE_INVALID:
+               return ENXIO;
+       case ERROR_FILE_NOT_FOUND:
+               return ENOENT;
+       case ERROR_HANDLE_DISK_FULL:
+               return ENOSPC;
+#ifdef ENODATA
+       case ERROR_HANDLE_EOF:
+               return ENODATA;
+#endif
+       case ERROR_INVALID_ADDRESS:
+               return EINVAL;
+       case ERROR_INVALID_AT_INTERRUPT_TIME:
+               return EINTR;
+       case ERROR_INVALID_BLOCK_LENGTH:
+               return EIO;
+       case ERROR_INVALID_DATA:
+               return EINVAL;
+       case ERROR_INVALID_DRIVE:
+               return ENODEV;
+       case ERROR_INVALID_EA_NAME:
+               return EINVAL;
+       case ERROR_INVALID_EXE_SIGNATURE:
+               return ENOEXEC;
+#ifdef EBADRQC
+       case ERROR_INVALID_FUNCTION:
+               return EBADRQC;
+#endif
+       case ERROR_INVALID_HANDLE:
+               return EBADF;
+       case ERROR_INVALID_NAME:
+               return ENOENT;
+       case ERROR_INVALID_PARAMETER:
+               return EINVAL;
+       case ERROR_INVALID_SIGNAL_NUMBER:
+               return EINVAL;
+       case ERROR_IOPL_NOT_ENABLED:
+               return ENOEXEC;
+       case ERROR_IO_DEVICE:
+               return EIO;
+       case ERROR_IO_INCOMPLETE:
+               return EAGAIN;
+       case ERROR_IO_PENDING:
+               return EAGAIN;
+       case ERROR_LOCK_VIOLATION:
+               return EBUSY;
+       case ERROR_MAX_THRDS_REACHED:
+               return EAGAIN;
+       case ERROR_META_EXPANSION_TOO_LONG:
+               return EINVAL;
+       case ERROR_MOD_NOT_FOUND:
+               return ENOENT;
+#ifdef EMSGSIZE
+       case ERROR_MORE_DATA:
+               return EMSGSIZE;
+#endif
+       case ERROR_NEGATIVE_SEEK:
+               return EINVAL;
+       case ERROR_NETNAME_DELETED:
+               return ENOENT;
+       case ERROR_NOACCESS:
+               return EFAULT;
+       case ERROR_NONE_MAPPED:
+               return EINVAL;
+       case ERROR_NONPAGED_SYSTEM_RESOURCES:
+               return EAGAIN;
+#ifdef ENOLINK
+       case ERROR_NOT_CONNECTED:
+               return ENOLINK;
+#endif
+       case ERROR_NOT_ENOUGH_MEMORY:
+               return ENOMEM;
+       case ERROR_NOT_OWNER:
+               return EPERM;
+#ifdef ENOMEDIUM
+       case ERROR_NOT_READY:
+               return ENOMEDIUM;
+#endif
+       case ERROR_NOT_SAME_DEVICE:
+               return EXDEV;
+       case ERROR_NOT_SUPPORTED:
+               return ENOSYS;
+       case ERROR_NO_DATA:
+               return EPIPE;
+       case ERROR_NO_DATA_DETECTED:
+               return EIO;
+#ifdef ENOMEDIUM
+       case ERROR_NO_MEDIA_IN_DRIVE:
+               return ENOMEDIUM;
+#endif
+#ifdef ENMFILE
+       case ERROR_NO_MORE_FILES:
+               return ENMFILE;
+#endif
+#ifdef ENMFILE
+       case ERROR_NO_MORE_ITEMS:
+               return ENMFILE;
+#endif
+       case ERROR_NO_MORE_SEARCH_HANDLES:
+               return ENFILE;
+       case ERROR_NO_PROC_SLOTS:
+               return EAGAIN;
+       case ERROR_NO_SIGNAL_SENT:
+               return EIO;
+       case ERROR_NO_SYSTEM_RESOURCES:
+               return EFBIG;
+       case ERROR_NO_TOKEN:
+               return EINVAL;
+       case ERROR_OPEN_FAILED:
+               return EIO;
+       case ERROR_OPEN_FILES:
+               return EAGAIN;
+       case ERROR_OUTOFMEMORY:
+               return ENOMEM;
+       case ERROR_PAGED_SYSTEM_RESOURCES:
+               return EAGAIN;
+       case ERROR_PAGEFILE_QUOTA:
+               return EAGAIN;
+       case ERROR_PATH_NOT_FOUND:
+               return ENOENT;
+       case ERROR_PIPE_BUSY:
+               return EBUSY;
+       case ERROR_PIPE_CONNECTED:
+               return EBUSY;
+#ifdef ECOMM
+       case ERROR_PIPE_LISTENING:
+               return ECOMM;
+       case ERROR_PIPE_NOT_CONNECTED:
+               return ECOMM;
+#endif
+       case ERROR_POSSIBLE_DEADLOCK:
+               return EDEADLOCK;
+       case ERROR_PRIVILEGE_NOT_HELD:
+               return EPERM;
+       case ERROR_PROCESS_ABORTED:
+               return EFAULT;
+       case ERROR_PROC_NOT_FOUND:
+               return ESRCH;
+#ifdef ENONET
+       case ERROR_REM_NOT_LIST:
+               return ENONET;
+#endif
+       case ERROR_SECTOR_NOT_FOUND:
+               return EINVAL;
+       case ERROR_SEEK:
+               return EINVAL;
+       case ERROR_SETMARK_DETECTED:
+               return EIO;
+       case ERROR_SHARING_BUFFER_EXCEEDED:
+               return ENOLCK;
+       case ERROR_SHARING_VIOLATION:
+               return EBUSY;
+       case ERROR_SIGNAL_PENDING:
+               return EBUSY;
+       case ERROR_SIGNAL_REFUSED:
+               return EIO;
+#ifdef ELIBBAD
+       case ERROR_SXS_CANT_GEN_ACTCTX:
+               return ELIBBAD;
+#endif
+       case ERROR_THREAD_1_INACTIVE:
+               return EINVAL;
+       case ERROR_TOO_MANY_LINKS:
+               return EMLINK;
+       case ERROR_TOO_MANY_OPEN_FILES:
+               return EMFILE;
+       case ERROR_WAIT_NO_CHILDREN:
+               return ECHILD;
+       case ERROR_WORKING_SET_QUOTA:
+               return EAGAIN;
+       case ERROR_WRITE_PROTECT:
+               return EROFS;
+       default:
+               return -1;
+       }
+}
+
+static void
+set_errno_from_GetLastError()
+{
+       errno = win32_error_to_errno(GetLastError());
+}
+
 /* Pointers to functions that are not available on all targetted versions of
  * Windows (XP and later).  NOTE: The WINAPI annotations seem to be important; I
  * assume it specifies a certain calling convention. */
@@ -1724,7 +1997,7 @@ win32_encrypted_import_cb(unsigned char *data, void *_ctx,
 
        len = min(len, wim_resource_size(lte) - ctx->offset);
 
-       if (read_partial_wim_resource_into_buf(lte, len, ctx->offset, data, false))
+       if (read_partial_wim_resource_into_buf(lte, len, ctx->offset, data))
                return ERROR_READ_FAULT;
 
        ctx->offset += len;
@@ -2577,21 +2850,14 @@ fsync(int fd)
        HANDLE h;
 
        h = (HANDLE)_get_osfhandle(fd);
-       if (h == INVALID_HANDLE_VALUE) {
-               err = GetLastError();
-               ERROR("Could not get Windows handle for file descriptor");
-               win32_error(err);
-               errno = EBADF;
-               return -1;
-       }
-       if (!FlushFileBuffers(h)) {
-               err = GetLastError();
-               ERROR("Could not flush file buffers to disk");
-               win32_error(err);
-               errno = EIO;
-               return -1;
-       }
+       if (h == INVALID_HANDLE_VALUE)
+               goto err;
+       if (!FlushFileBuffers(h))
+               goto err;
        return 0;
+err:
+       set_errno_from_GetLastError();
+       return -1;
 }
 
 /* Use the Win32 API to get the number of processors */
@@ -2610,8 +2876,8 @@ wchar_t *
 realpath(const wchar_t *path, wchar_t *resolved_path)
 {
        DWORD ret;
-       wimlib_assert(resolved_path == NULL);
        DWORD err;
+       wimlib_assert(resolved_path == NULL);
 
        ret = GetFullPathNameW(path, 0, NULL, NULL);
        if (!ret) {
@@ -2631,8 +2897,7 @@ realpath(const wchar_t *path, wchar_t *resolved_path)
        }
        goto out;
 fail_win32:
-       win32_error(err);
-       errno = -1;
+       errno = win32_error_to_errno(err);
 out:
        return resolved_path;
 }
@@ -2645,8 +2910,7 @@ win32_rename_replacement(const wchar_t *oldpath, const wchar_t *newpath)
        if (MoveFileExW(oldpath, newpath, MOVEFILE_REPLACE_EXISTING)) {
                return 0;
        } else {
-               /* As usual, the possible error values are not documented */
-               errno = -1;
+               set_errno_from_GetLastError();
                return -1;
        }
 }
@@ -2687,9 +2951,7 @@ fail_close_handle:
 fail:
        if (err == NO_ERROR)
                err = GetLastError();
-       ERROR("Can't truncate \"%ls\" to %"PRIu64" bytes", path, size);
-       win32_error(err);
-       errno = -1;
+       errno = win32_error_to_errno(err);
        return -1;
 }
 
@@ -2709,4 +2971,85 @@ win32_strerror_r_replacement(int errnum, wchar_t *buf, size_t buflen)
        return 0;
 }
 
+static int
+do_pread_or_pwrite(int fd, void *buf, size_t count, off_t offset,
+                  bool is_pwrite)
+{
+       HANDLE h;
+       LARGE_INTEGER orig_offset;
+       DWORD bytes_read_or_written;
+       LARGE_INTEGER relative_offset;
+       OVERLAPPED overlapped;
+       BOOL bret;
+
+       wimlib_assert(count <= 0xffffffff);
+
+       h = (HANDLE)_get_osfhandle(fd);
+       if (h == INVALID_HANDLE_VALUE) {
+               errno = EBADF;
+               return -1;
+       }
+
+       /* Get original position */
+       relative_offset.QuadPart = 0;
+       if (!SetFilePointerEx(h, relative_offset, &orig_offset, FILE_CURRENT))
+               goto err;
+
+       memset(&overlapped, 0, sizeof(overlapped));
+       overlapped.Offset = offset;
+       overlapped.OffsetHigh = offset >> 32;
+
+       /* Do the read or write at the specified offset */
+       if (is_pwrite)
+               bret = WriteFile(h, buf, count, &bytes_read_or_written, &overlapped);
+       else
+               bret = ReadFile(h, buf, count, &bytes_read_or_written, &overlapped);
+       if (!bret)
+               goto err;
+
+       /* Restore the original position */
+       if (!SetFilePointerEx(h, orig_offset, NULL, FILE_BEGIN))
+               goto err;
+
+       return bytes_read_or_written;
+err:
+       set_errno_from_GetLastError();
+       return -1;
+}
+
+/* Dumb Windows implementation of pread().  It temporarily changes the file
+ * offset, so it is not safe to use with readers/writers on the same file
+ * descriptor.  */
+extern ssize_t
+win32_pread(int fd, void *buf, size_t count, off_t offset)
+{
+       return do_pread_or_pwrite(fd, buf, count, offset, false);
+}
+
+/* Dumb Windows implementation of pwrite().  It temporarily changes the file
+ * offset, so it is not safe to use with readers/writers on the same file
+ * descriptor. */
+extern ssize_t
+win32_pwrite(int fd, const void *buf, size_t count, off_t offset)
+{
+       return do_pread_or_pwrite(fd, (void*)buf, count, offset, true);
+}
+
+/* Dumb Windows implementation of writev().  It writes the vectors one at a
+ * time. */
+extern ssize_t
+win32_writev(int fd, const struct iovec *iov, int iovcnt)
+{
+       size_t total_bytes_written = 0;
+       for (int i = 0; i < iovcnt; i++) {
+               size_t bytes_written;
+
+               bytes_written = full_write(fd, iov[i].iov_base, iov[i].iov_len);
+               total_bytes_written += bytes_written;
+               if (bytes_written != iov[i].iov_len)
+                       break;
+       }
+       return total_bytes_written;
+}
+
 #endif /* __WIN32__ */
index e525ccb..51e2f3f 100644 (file)
@@ -77,4 +77,13 @@ win32_global_cleanup();
 extern int
 win32_strerror_r_replacement(int errnum, tchar *buf, size_t buflen);
 
+extern ssize_t
+win32_pread(int fd, void *buf, size_t count, off_t offset);
+
+extern ssize_t
+win32_pwrite(int fd, const void *buf, size_t count, off_t offset);
+
+extern ssize_t
+win32_writev(int fd, const struct iovec *iov, int iovcnt);
+
 #endif /* _WIMLIB_WIN32_H */
index 16ce531..1dd35e5 100644 (file)
@@ -48,6 +48,7 @@
 #endif
 
 #include <unistd.h>
+#include <fcntl.h>
 #include <errno.h>
 
 #ifdef WITH_NTFS_3G
 
 #include <limits.h>
 
+#ifndef __WIN32__
+#  include <sys/uio.h> /* for `struct iovec' */
+#endif
+
 /* Chunk table that's located at the beginning of each compressed resource in
  * the WIM.  (This is not the on-disk format; the on-disk format just has an
  * array of offsets.) */
@@ -1833,7 +1838,7 @@ lock_wim(WIMStruct *w, filedes_t fd)
 static int
 open_wim_writable(WIMStruct *w, const tchar *path, int open_flags)
 {
-       w->out_fd = open(path, open_flags, 0644);
+       w->out_fd = topen(path, open_flags, 0644);
        if (w->out_fd == INVALID_FILEDES) {
                ERROR_WITH_ERRNO("Failed to open `%"TS"' for writing", path);
                return WIMLIB_ERR_OPEN;